Printable Hard Sudoku

Set ywlua4. 8 puzzles with an answer key, ready to print.

Hard puzzles start with about 29 givens and need real techniques: pointing pairs, naked pairs and hidden pairs. Paper is a great way to practice them, because you have to keep your own notes honest.

Each free PDF has 8 puzzles, four to a page on US Letter paper, plus an answer key with every solution. Every puzzle has exactly one solution. A new set appears here every day, or you can grab a different set any time.

Puzzles in this set

Hard #1
1 3 2 7 6
6
5 3
7 3 6 8
3 1 4
2 1 4 7 9
8 5 7 3
2 7
7 6 9
Hard #2
3 7 8 4
5 6 9
4 9 6 1 2
2 7 3
5 4 9
1
8 2
5 4 7
1 2 3 7 5
Hard #3
1 9
1 2 7 3
2 4
3 7 2 9
4 3 6
7 9 8
2 9 3 6
1 2 4
3 8 5 9
Hard #4
4 8 6
4 9 8
5
9 5 1
2 1
8 6 5 2 3 4
7 3 1 6
4 9
5 6 4 7 1
Hard #5
6 8 9
1
3 5 7 9 1 4
8 1 5
2 8 9
6 3 7
9 3
9 2 4 6
4 6 7 5
Hard #6
8 9
5 4 1
7 4 2 8 3
4 3 5 6 2
5 7 8
2 6 8
5 6 4
2 9 5
7 4
Hard #7
8 2 4 9 1
3 9 1 2
8
6 4 1
4 9 7
7 1 5 6
6 5 8
8 3 7
2 8 5
Hard #8
7 3 5 2
4 8
5 1 6 7
6 9 3
2 7 9
7 8 5
2 3 5 9
5 9
8 1 5 4

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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